//
//  Copyright (C) 2010 Vadim Ushakov
// 
//  This program is free software; you can redistribute it and/or modify it
//  under the terms of the GNU General Public License as published by the Free
//  Software Foundation; either version 2 of the License, or (at your option)
//  any later version.
// 
//  This program is distributed in the hope that it will be useful, but
//  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
//  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
//  for more details.
//  
//  You should have received a copy of the GNU General Public License along
//  with this program; if not, write to the Free Software Foundation, Inc.,
//  59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
//

#ifndef _KERNELCIRCULARBUFFER_H
#define _KERNELCIRCULARBUFFER_H

typedef struct _kernelCircularBuffer
{
	volatile void* data;
	volatile int size;
	volatile int readerPosition;
	volatile int writerPosition;
	volatile unsigned overrun;
	int fastNotifyProcessId;
} kernelCircularBuffer;

int kernelCircularBufferAllocate(kernelCircularBuffer* buffer, int size);
int kernelCircularBufferFree(kernelCircularBuffer* buffer);

int kernelCircularBufferWrite(kernelCircularBuffer* buffer, void* data, int size);
int kernelCircularBufferRead(kernelCircularBuffer* buffer, void* data, int size);

int kernelCircularBufferPurge(kernelCircularBuffer* buffer);

int kernelCircularBufferSetFastNotifyProcessId(kernelCircularBuffer* buffer, int processId);

unsigned kernelCircularBufferGetOverrun(kernelCircularBuffer* buffer);
unsigned kernelCircularBufferDecrementOverrun(kernelCircularBuffer* buffer);

int kernelCircularBufferGetBufferSize(kernelCircularBuffer* buffer);
int kernelCircularBufferGetDataSize(kernelCircularBuffer* buffer);
int kernelCircularBufferGetFreeSize(kernelCircularBuffer* buffer);

#endif/*_KERNELCIRCULARBUFFER_H*/


